Question about Hyundai Sonata
The surge is caused by a high idle situation where the computer pulls it down but it goes back up again,hence the surge.Hopefully it is just pure bad timing that it played up after the brakes being done as nothing needs to be disturbed by it.One came into my shop like this and the idle air bleed had been tampered with.this is located on the throttle body(this is where your accelerator cable goes to).It should have a black rubber plug in it about the diameter of an aaa or aa battery end.remove this(some are already missing),inside this is a flat screw type head.Using the right size screwdriver slowly turn this clockwise while the engine is running in park.You should only have to turn this 1/2 to 1 turn in to alter the idlespeed.if no change or it slows then surges again,we will have to check some other areas.Also check your coolant level in your radiator,as these have 2 small hoses that feed coolant through the throttle body,this can give same symptons.There are a few other things to check but at this stage just check these 2 items and of course look for any hoses or sensor plugs that are not on,or any loud hissing of air escaping anywhere.Hope this helps.
Posted on Mar 22, 2011
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Posted on Jan 02, 2017
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